
*{
    margin: 0;
    padding: 0;
}
/* 按钮 */
.btn {
    display: inline-block;
    font-weight: 400;
    color: #212529;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
}

/* 注释 */
.comment {
    display: block;
    background: #fdf6e3;
    padding: 20px;
    margin: 20px 0;
}

/* 表格 */
table {
    border-collapse: collapse;
    font-size: 0.875rem;
}

.table-bordered {
    border: 1px solid #dee2e6;
}

.table .thead-light th {
    color: #495057;
    background-color: #e9ecef;
    border-color: #dee2e6;
}

.table-bordered thead th,
.table-bordered thead td {
    border-bottom-width: 2px;
}

.table thead th {
    vertical-align: bottom;
    border-bottom: 2px solid #dee2e6;
}

.table-bordered th,
.table-bordered td {
    border: 1px solid #dee2e6;
}

.table th,
.table td {
    padding: 0.75rem;
    vertical-align: top;
    border-top: 1px solid #dee2e6;
}